Just from my own tests for anyone who may find this thread while looking up the same question: Zaros has more things that feel the same as osrs, while Ikov and other rsps have things that feel off (which are worse not better). Zaros has normal osrs zulra, ikovs is different, feels eaasier. Ikov some places you cant go, like the dagganoth kings cave isnt complete, and you cant go up the rope at gwd, ect. Also for irons, Zaros has less ways to cheat with shops and stuff. So I'm picking Zaros as the better server.